Progressively-movable electric switch and controlling mechanism therefor.



B. G. DUNHAM. PROGR-ESSIVELY MOVABLE ELEOTRlO SWITCH AND CONTROLLING MECHANISM THEREFOR.

APPLICATION FILED JAN.2,

Fatented Dec. 14, 1915.

3 SHEETS-SHEET l.

MF Z animator B. G. DUNHAIVI. PBOGRESSIVELY MOVABLE ELECTRIC SWITCH AND CONTROLLING MECHANISM THEREFOR.

APPLICATION FILED IAN.2, I908. 1

Emmet? Dec. 1%, 19b5,

3 SPEETS-SHEET 2.

QDUNHAM.

' B. PROGRESSWELY MOVABLE ELECTRIC SWKTCH AND CONTROLLING MECHANISM THEREFOR.

APPLICAFIUN FILE!) JANEZ, I908.

Patented Dec. 14, 1915.

3 SHEETS-SHEET 3.

BERT G. DUNTZI D/I, OF ROCHESTER, NEV] YQBK, ASSIGNUR, BY Il/IESNE ASSIGNMENTS, T0 WESTERN ELECTRIG COMPANY. 03: NEW YQRK, N. 3. A CORPORATION OF runners.

Specification of Letters Patent. D 14 1915 Application filed January 2, 2903. Serial No. lfififil.

To all IIILCWZ 2'15 may concern:

Be it known thatl, llnnr G. DUNH.\M,..ot Rochester. .in the county of Monroe and State of New York have invented certain new and useful Improvements in Progres sive y-lvlovablc Electric Switches andControl'lin ll'lechaiusm Theretor and I do b a hereby declare the following to be a full,

clear. and exact description of thesanie, we

erence beinghad to the accompanving drawings, forming a part of the specification and to the reterence-numerals marked thereon.

lrl y present invention relates to electric switches and has for its primary object to provide an improved means for controlling the operation thereof, whereby the movable elements or wipers of a switch may be advanced progressively, arrested in the desired position of adjustment and restored to their normal position, said functions being performed automatically in conjunction with the other instruments or a system of instruments with which the switching: mechanism may be employed.

To these and other ends the invention con ts in certain improvements and conibinations of parts all as will be hereinafter more tally described. the novel features being; pointcil'out in the claims at the end at c specification. airings: Figures 1 and 2 are dia- 'iews illustrating the essential in the {l 'ggra uin'iat portions-oi ating devices therefor constructed in accord,- ance with my invention. Fig. 3 is a plan view illustrating the mechanical construction of the switch, it is a (let-ail sectional view taken on the line l 4 of Fig. 3. Fig. 5 is a similar view taken on the line 5 -5 of Fig. :2. Figs. (3 and 7 are detail views of pawl and detent.

Tainiilar reference numerals figures indicate similar parts.

in the several in the illustrations l have shown a switclr inn; mechanism enibmlying my iuventimi ranged to perform the function of finder switch for an autoumlie telephone system operating: on the principle of central energy, in which use it serves to connect diiierent telephone instrunic t circuits or one of sevcral such circuits with another instiuuncnt, for instance, another" switch or group of switch s for performing additional operaa switching mechanism and opentions. To this end the controlling mechanism comprises electromagnetic devices which operate con ointly to start the movalole parts of the switch when an instrument circuit is closed and continue their progressive movement automatically until the ter minals of such circuit are engaged, at which time said parts are ar 'ested and retained in adjusted position until the instrument circuit is destroyed. when they are returned to their normal. position in readiness for a subsequent operation.

My invention comprehends an association of parts which shall cooperate to enable the various functions of the apparatus to be ear ried out over complete metallic circuits, as distinguished from circuits in which ground or earth connections are employed in 0011- junction with one or both sides of theinstrurnent circuit for ed'ecting the movements of the adjustable parts of tlie'switcln For. con; in illustration, as well as to facilitate hill/1UP: the various circuits, to which location will be made hereinafter, these are shown supplied with current from different sources or. batteries and conventional ground corn have been'shown, but it Will be under-st" n that the several. circuits are provided. wi current from a main battery or source of current supply and that said grounds indicate the return" path or Wire connected to the main battery.

in illustrating the preferred embodiment of my invention, 1 have shown a switch of the ste pJgy-step type comprising generally a progressively movable member]. which is adapted to he advai'lced' progressively and to this end made circular in form and is mounted upon a. revolnble shaft 2 journaled at its lower end in a base plate .3 and suparranged in sets, those of each being 10 catcd 1n vertu l alinenient. 'ihe correspi'indine' terminals of the seven-l sets are supported in horigzontal alinemcnt up'on a Whieh one end of the base portion 3 is re ceived. These iiroviued with V shaped grorwes reeeiving cor-res};ondingly shaped Way on the part; 3, e nst.ructi l)i1 which insure the accurate ulinement eti the two parts 01 -.l e hzise hmth horizuntully and vertically zrn pea-mite the wipers to he z1crelation to their rceuratelv pt id spec-the rows 0t semizzcts'when the suppmrts tee these parts we hreught together.

0f the eeutnet elements or wipe with segments 6 '76" and S, with which eeiiperete brushes 15, 16 and. 17 supported in the holder 18, of i11- suietingz inuteriui secured to one of he ends of the bracket Connected t0 the lower end at the shaft 2 is 21 (xii spring; 19, ranged in e easing t i which its outer end is attached, the tension applied to the spring being; eutheieut to return the shaft and. the parts supported thereeu t0 the normal position, ehew'n in 2 when they are released. I

The means for retzvtiug the movable (toritact elements eoxnpriee a leaf spring 21, supported on the upper end 5,. an arm 2:2, having uliicieifit tension te nm'mall v engage the teeth or seri' ous 23 on the eriphery hf the member 1 and formi" pawl for drivingz the letter, The ar pivoted at the point end in L ed with :i lntereliy extending" end 20 t' "1 ing an. armature which eeiiperizies 1 1e motor magnet empieyed for eetu the up hating de vices. Alisa carried en the arm is :r stud 3:2 against which bears th end 0f the spring tending; to more e arm in :1 direction. to advance the member 1 armature 25 interet acted position when the motor magnet is deeuerggized. The locking device consists of a leaf spring" detent :27 normally engaging the teeth 23, wlirich is er- "enged beneath. the spring pawl 21 and is sumierted 011 the 3 by a clip pinte E28 zidst secured by sore 2 in such 1305i tien that when th pawl 91 is moved later-- ally mu; 0? t with the teeth. 23 it will engage the tent and cause it he also mmed him rm. imperative position.

' the mitimble eleluteh member or vhieh 1 merit een'apr. a t L J p 3Q having: en el t0 hook over the euu At 1" 21h t0 the re. Y ated. fine; up

carrying at it e pawl 21 is zilwey disengage r ratchet wheel or elei'nent l \J'llffll the in is 111 its normal [)U fltlOiL and that 11F and move the ,mauner in which any one 0': a plurz hip; 0.1

e-ihmteu Supported on the base plate V e (i v stud Pm whit.

i 1 unit,

d8 mitted when it mm gage the end of lip m? retain its eiigeggermarit there treated to hold the pawl am an inane utive pesitioii. From merit of the parts it will hitch arm or triii 3 i ing laterally t Ward the puwh by the 38, the pawl viii he disengaged the release the detent a. permitted to snap int: member 1' Wheneree the iiwter llmgllfll/ iii 1e energized.

* emunhuie tm; which will he in CO'eiik-BCLHI] the"cliagrzmmmtie illuetrutieug whitii formed by it contact sprii'ig fl-ii play ir u tween insulated emrztriet :memheine 4.6 ii support *d by a holder &8 4311 the base p The spring he e normal teiuieiiev to engage the Contact 4H3, but. is held in E f ment ith the cieiteet 4:7 when the mm'ehh), member in its NF mail position, i J 1i pie &9 mounted (in he latter which relwu aid spring upon-thefirst step er movement (if said member.

The switch and the i'neclmnisn'i eeutruliiu it may he used .r purposes other time the one mentioned, but as it is; especially :zdimi eini for use in cenneetion with :iuteuizit'w phone systems it use will he deer: connection therex the eperutiur. th illustrated. in Figs. It and 2, slmmug :olinevted with e the (1 751" dz? 9 rule,

instrument cirvuits may 1. s single instrument circuit. 'lwo of tucts of each set 0:! terminals, such 10, are dill Died to the liiie .vires m." tors 0f instrruuent circu ts, While the er ene 11 it'eri'us the ieru'iinzil (if :1 hreiuh up ating or holding eircuit there he these hmuches for enel instrument eircuit me which serve successively to coiiipiete 1 vii;- euit of the reiays controlling 'th 2 11.0%." in net to :ause the successive nperutieu the to advance the Wipers. in I" 3 the swtis shown provided wiil' 2 heel; (iii em containing :iiit v terminals .1

' amine wiou. ml mum instrumehts v r illustrated. the e 1 item? with n r L (M The remaining instrument circuits L. and

D, it will he umli-zrstoolh ire similarly connected respectively with the third second and firs of terminals. lridged across the line wires of each circuit at i ollice, or exchange, are relays J I which havetwo windings one For ac; an 9 of the line, connected in tandem to balar the line, their extremities being connected to the wires i by the wires 0". a? i the source of current supply repi A battery Z, whereby each of them will he energizcd when its respective instrument circuit is closed. The subscribefls instrument included in this circuit comprises the usual transmitter T; receiver R and the normally open hook contacts i l".

The operating or holding; circuit lwanches corresponding to each instrument circuit, in dicated by A, l3", (J g lead respectively, from the terminals 11, Ill ll" and 11 to hack contacts a, 1), and (Z of armatr es c,

ays associated therewith which may he termed controlling and arresting relays which operate conjointly to cause the motor magnet to be energized and dcenergized successively in unison with one ct them and finally arrested in the desired adios-zed position when it is rendered inacti e until the movable contact elements or wipers have been restored to their normal pos last mentioned operation is eli ec of the release magnet 3.4 which with a circuit controlled by addit lays to which specific mention will more fully hereinafter.

The contr lling relay, and the arresting l y, indicated by 0, arranged in norma ly ope tarting cl which is supplied with curr eenerally the motor magnet 26 and two neoi'isly, the controlling relay 0 supplying the initial impulse of current to start the motor magnet and the arresting relay S closing: the operating or holding circuit for the two relays, whereby additional impulses of current may he transmittedto the motor magnet to cause it to advance the movable contacts or wipers on the member 1 one or moie steps. For this reason one end of the coil oi the arrestingrelay S is attached to the back contact 4-? by a wire 8, the other end thereof leading to the battery Z On the motor magnet 26 is an armature 0 connected. hy the wire 0 to the wire 8, and normally cooperating with a back contact 0 joined O by the wire 0 to one end of the coil of the controlling relay 0 which is supplied by current fir-om the battery Z It will thus be seen that when the circuit, of an instrument, such as A, is closed, and the line relay, such as A, thereof is energized, its armature a, will be attracted and the morahle contact elements or wipers of the switch being: in the normal position, the following circuits will be completed: ground 2 armature 1", contact a, booster wire A, spring contact arm 45, contact 47, wire 8, relay *0, battery Z and wire 0', armature 0, contact 0 wire 0", relay 0, battery Z This energizes both the relays S and O. The energizing oi the controlling relay 0 closes the armature 0 into engagement with the forward contact if: grounded at .2 and as said armature connected by the wire 0 to the coil of the motor magnet 26 which receives current l'rom the battery Z, the motor mag netwill att act its armature 0 to interruptthe current, in the'circuit of the controlling relay 0, which in turn will release the armature 0*. This starting impulse of current in the circuit of the. motor magnet advances the member 1 a single step, causing the wipers thereon to engage the first set of terminals in the bank, whereupon the booster or starting circuit is broken by the spring contact 4-5 and current, is supplied oier the operating or holding circuit, which retains the relays in energized condition until the contact elements have been advanced to pick The third wiper 8 is connected by the wire is to the armature s which is actuated by the relay S into engagement with the,

for: 3d contact 5 connected to the wire a,

7 motor magnet circuit at the cor-.ta'ts ture 8 contact 8, relay '8, bit- L Leo iJoni the ha (ill'l't :iliove out-- on; the

so that as saicl Wiper engages the 11 (Fig. 2) an impulse of current will erse the following path: ground ture a, contact d, branch D termini wiper 8, (Fig theme by ire .si,

I I i Wires 3, 0 armature 0, contact 0 W1 relay 0, battery Z 1). The ing of the relay S closes' thc set of: on s, e and energizes relay 0 Whf ch cle iinei 7 ill ch arniaturc c iinal 10 Allifi ins V circuit curr nt for l su iilie l by the usual (l. conventionally by and C55.

se mechanism reetoriu h to their nominal n; ion.

The impulse-of current actuates the motor magnet which in turn; opens the circuit the controlling relay it the contacts 0;

causing the controlling relay O to l capable of on, t ion 1 "l energized with the consequent 6 reiuleif cl o erativo tion of the motor n'ia'gnet, which alloi motor spring; 22 to advance t ie "vet engagement with the second. set ii? 7 nails Thus it will be seen Ll-- the laei c niechanien in read to his mentioned circuits will be energized, each .ay under cert in cirei Ili'lfll tiinethe Wiper 8 engages a closer branch alzhe parts "c that the Wipers will be arrested i erniinal of an open branch, s1 'l nee up,'at which time the will he in register with the tern-ma lO of the subscribers instr ll which a call was initiated by the act sing the line wires A, AF. r or the purpose of illusti operating or holding circuit term close:

the i1 s for operali i ing the ope] tion of the switching mechanism. in one i. e to he on M the simplest uses to which it may he per i eurrem it nilhas been shown as employed for conneo .runmnt circuit of a plurality of instrument circuits with to contacts lithe other hen f i 10o ices. and adapt d to he 4 1- single circuit which, for convenience in 1 l sot cl contacts and, holei the cimtact elements of 'ch are (ill normal.

will he termed the ca .i.nc. the hrushesli and "Z and lend ption, The hitter 1S tied to comprises the wires E, E which through normally closed contacts on the 'e em'l oi the coil oi the Pele-L 10!; magnet P, represented by ari'natu? is 0', c1, conn ei'iai by e wire to eoope 'eting with be ch contacts: :2, 0" from. 2* out o relay ll which on which the line wires E and if?" m curl. oh contact r from. which A Bridging the latter is a line 11 conthe armati git heing the ex .1 l0

supplied thereto by the battery 21' for the reuse engaging V ol V gum; .lne

purpose of attracting an armature e to open the release circuit of the switch and prevent the restoring of the Wipers thereoif. while the selected calling line is closed. it hasheen stated that the extelulecl circuit ma be uscil for connecting a calling circuit the wage: to a I newt-ml to .rrai'ugnu I re -21y 115 'isiug a bah with other devices, such as another switch or a groan of sw'tchcs i'or performing; znlchti-inal o iei.

tions incidental to the conneymg nomazilly 12f extended circuit with the circuit of some in; a. terminal. particular instrument which it is :ieeirml to boos or c: ll, such as would be required in. e l relay of: any magnitude. lfl0\'\(;"\t1,lll the pr when to contact instance in order to describe the compi operation of" the mechanism, hare shown 3'; e connection of telephone lllSlZl'lllYlt t :7 7 l 'heir uoriril e rcuit with the wires E; l comprising i the line Wires F F across l the inorable parts of .but as the switching relay S is ne tion of the release tioned armature closes the lease relay R, battery Z, The energi of. the last mentioned relay closes ture rinto engagement with the during the progressive increment of the switch Wipers, the cicuit of role R is opened by the armature 8' during gressive movement of the suitel1. i remembered that the moment the wipers and 7 are arrested they engage the terminals of a closed instrument circuit, such as 9,

and mi and the extended line is supg ied with current energizing the relay l] with the consequent result that when the urineture s is turned loose, the armature c of re lay E is attracted, hence the normally closed contacts (2," c); in the release circuit opened "before thenorinuily open. contacts- (r, r) are closed I loy the release relay R- which'latter is'energizedwhen the switch- *ing relay S is de uergized. it will be seen, therefore, that the, release circuit 1s rendered j j noperat ve during the time the line, extendcol through the switch Wipers, is energized but that when the current is removed from the line the armature e is released end ourrent'is permitted to traverse the following path: ground .2, contact e armature 6, wire 7, contacts 'I' end 5*", Wire 7", release magnet 34, "wire f contact i, armature Z,

battery ZR i The actuation oir the release magnet attracts its armature 32, and the trip 30 in operative position and in order to do energize said magnet, to ,oer

starting-circuit and current is retained in the reliiy during the return movement of ,the switch Wipers by a holding circuit, 'WlTLOll latter comprises the armature Z arranged in that portion of the circuit of the wire A ivhichisattelched to the spring (l5, said." armature being adopted: to co'o'perate with the forwardicontsct or terminal Z of the wire] leading to the heck contact 0" of the armature 0? on the operatingreley U and extending therefrom over the wire Z which is connected to one end oi. the coil of 'Lthe relay L, the other extremit thereof receiving current from the u starting circuit comprises the wire 15", joined The to the Wire Z which tei'niii in e for ward Contact Z the moisture i? or mged 0n the rclezfseinsgnet 3 1nd grounded cs iiidiceteol at 2 The ettre on of the la lit the spring 37 to retract the trip, the third sotoi coin ground .2 armature i contact Z wire Z, relay L, but cry which causes the fililli'illllfi Z and Z to pull up, the former opening the release magnet circuit and the latter closing the following circuit, which retains currentin the loc ing relay Lentil the member 5 of the switch has been restored to its uornu position: ground 2", contact all Wire A, armature i contact Z", n tact 0 armature 0 wire Z", reley L, 1 Z The application of the hole in; circuitto the locking relay L enables it to hold the release circuit open and retain current in the relay P to retain the extended line in open condition during the retrograde movement of the ivigers which prevents iii-nuitures e, e and E from buzzing and removes possible disturbances from their respective lines. The armature o is arranged in i 7 last mentioned circuit to insure the relay releasing its arinetur s and to serve s test to determine that the release circuit is restored'ufter each operation, so that in the event said relay should he slug ish in its operation it could not hold over t is switch should commence a second e2; ion dia'tely, as T or if an instrument oir cuit happens grade movement of the wipei justinent of the is was such that :1 cl break due to their peed of movement, did not take place hetwi i the spring andthe contact i6. 1 hen 9. switch of this cluirecter is employed as a fin. switch for t shone systems, plurality of them is employ-e iii oroups and the corresponding terminus on the several. switches are connected in 1 itifple and said groups ore associated LS1 other switches termed selectors and comic tors, the operation of which is effected on the line extended by one of the finder switches, as represented by the wires E", F, and E and E it is essential, therefore,

that the extended line should be open during the operation of u finder switch, both when its brushes are being advuncecl end res'tored, relay 1 therefore is provided with a divided circuit, the branches of which are controlled by each of therel-ays that it is energized to open the e; duringthe movement of the switch persin either direc ion. This circuit consists of the battery I5", the wire 32, from which lead the branches go and p connected to the erh: battery 25, "WllGS p,

ground a, the

ell? device switch, its operation in all. re-

iss peri' 'ectly aiiitomatic. Starting as noes from normal position, it is capable trareming a hank of contacts of any rlesir number by impulses of current received. er normally closed branch holding eir- '(l opera "in ceasing; and the switch liei arrested when one of them niche up the terminal of an open branch. iation oil the switching and oper" acting with the motor magnet in the manner described{*permits the latter to he WJELtB/(l. successively, While current is rel,"' he successive impulses received oil we wipers engages a closed operating "chit branch and the conjoint operation of me roleve prevents their subsequently be zerl after the movement, of the has ceased, preventing any n'ierence-With a connection esv the subsequent closing of any inent circuit leading to the bank taete This non-interference is 1. c on 'a'vhile e relay is actuated, e El when the latter fails to receive car 1 hflll azairl contacts are permitterlv to open Elem-an n becomes impossible to enlist either the arresting relay relay until the Wipers of en retnmecl to their norsition tor store the booster line in to be again energized. The reef the switch. requires but a single inioulee oi? mirrent and the arrangement of the circuit of the release magnet is such that it cannot be influenced by stray currents (luring theopcration of the motor clrivg devices and upon the colnple ion of their operation placed under the control of the cited strument circuit to operate l11'lm 3 rhzitelg upon the discontinuance of such circuit.

claim as my invention:

t in a switching mechanisnnthe'comhl i with a pllllzlllfy o1" termii als, a nor closed. brine operating circuit leach m1 each ter :inal, a contact element ooperating' with the terminals and mechae ncil in the switching and operating re -corresponding one nisni for aclvancir t rela. having a circuit which includes the contact element and by the latl is com pietetl successively over the branch eircu ite a motor magnet energized h" the action of the relay for actna tin g the arlx magnet, of a normally rlelineng'izerl relay controlling the operation .01? saicl magnet. means for cnerg'iziiw ai l I lay to cause a k ition of the motor magnet to he ellectec zillli means operated when the motor magnet is energized for subsequently tleenerg izing said ay and. by said relay cfi'ecting a co 'mncllng cleenergization oi the motor niagn t anal means inclmlin saitl movable contact elen'ient for causing continued :Iration of the motor in: net,

il. in a switching; mechanism, the combiwith a. plnraliw of terminala branch a thcrcironi, a contact ele any; with. the terminals and ring; it progressively, a sl mline circuit a il a T latter in'lncling the con circuit hranchee enceby. a controlling re 1 '/e l by the relay, 2 ml; for stealing; the advancing arlag'itcr to l'E'3fil1tr1glZGil by the causing the relay to he 1 .7 i anon it of the con act elranent means 101' no gmin: the starting circuit to ct the initial movenmnt oil the relay and magnet and a source of current supply for said circuits. A i

i in a switching" nlcrhaitier/51 the combination with a plurality terminals, a movlllJll'f! contact element cooperating therewith controllii;

a each :tulvancen .ancl mechanism for mlfnfiuliig it progres vsively comprising); a motor magnet oi elec Witching: 'illi llz' m the combi- "i av plmnlttv Ow i'lQ KlHlR. norbranch rn'vtnis ilWiUlSZ therefrom, a nier ihle contact clement coiinerutiitig progressively of a comprising a controlling relay which in circuitbranches, a main holding-circuit 7 adapted to be actuated upon each :ulvance- PM g (Went to w relay-S finch 1S ment of the contact element and an arrestcornnwn to the 310 ling circuit branches, sets ing relay for rendering the controlling rel; of closcll and open contacts in said holding inoperative, said motor magnet being arcircuit which are arranged to beopenell and ranged t b t d b th m- 13m closerl respectively by the energizing of one t lay, a starting circuit for supplying! the inll relays and the motor niagnet, an open iti l i l f t th 1; H circuit for the motor magnet wh ch is closed holding circuit for the arresting relay which 1S 's y 5 includes the contact element and is supplied SWINE Oil (1113311? PPL F I Q successivelv with current from the branch ll Swltchlng e Cmnbl" so circuits until the element engages the termi- 5 p y of insi'l'llmeni' l f branch hi l i balm 0130mm on s terminals correspon iing thereto and a means f Opening d b h d a nn-orall closed nolcling circiut branch lead-- source of current supply for said circuits. g f' 013911 l l 6, In s'itching n' echa nisny nbi- Cull] lltlllilll i l O1 JP-10h lll i l' llllliill- CIYCllliand {L5 natign ith a l lit f tenninui5 means operated by each "lStW-linlilt circuit mallv closed branch circuits leading; there-- gi the co dition o its correlfroni, a movable contactelement cooperatf' l 110ml: 5mm l Circuit ing with-the terminals and mechanism for l f f fi advancing it progressively comprising a operating w th ivitcl ternnnalsand as motor magnet, of mechanism for controlling lnwhillllsln ll g l g y the magnet comprising a mntmmng 1-day conrpiis nga motor magnet, oi. tao relays, a d an r ti l i it f 1- f,ainma n starting; circuit For energiaing them ing the latter energized during the advancewhich is conmnn to all the start ng circuit lneniyof the ontact, elgn ent until it engages lJi'flil'CllQS, 21 ll'lzllll lrOliii'flf l"- Wlilcll 1S :JlSO 9/3 the terminal of an open branch circuit, a 66111111011?) J cllcullt branches circuit for the controlling relay which is t e contact element supplied with current when the arresting re- Q i ll f r lay i's'enei'gized and is provided with a v F? 1101(11112; circuit? of contacts adapted to, be open when the arrange l h -gclggeii when we motor magnet is-lactuaterl, a circuit for said 1 I f "E 11 ur 1 motor magnet which is energized bythe c ncint for thenintor magnet having a set of trolling relay and a source of current supply t incl; are controlled lgv the other f aidmagnet d' h s of normally closeu contacts lo- 7. In a switching mechanism, the combi e mam holding circuit and arnation "with a plurality of terminals, norranger; to he opened by th :Hjfillntlmlflf the molly closed branch circuits leading; thei motor n'lagnet the purpose of scenerfrom, a movable contact element cooperri' gizing the last inen imerelay-to open the with th t i l d mechflllifg H, L mote: i 'z1t ans. a source cur-- varicing it progressively comprising; a motor m C Q LS magnet, of mechanism for controlling tle "-l h i niagnet comprising controlling relay anti V t J i an arresting relay, a starting circuit for srpplying an initial impulse of current to sa l relays and a 'holding circuit for the lat r which receives current during; the cove U tly to imp ment of the contact element, said holrling the operating device to circuit having a. set of open contacts which lenient into lcsireil are adapted to be closed by the arresti I a and. thereupon renrelay and a set of closed contacts adapted to remission current imbe opened when the motor magnet is enera (ye impossible, of a main gized, a motor magnet circuit which is closecl innit for parting the when the controlling relay is energized and curr nt to said relays, said cira source, of current supply for said circuits, cnit provioccl with a plurality of nor- 8. In a. switching mechanism, the combiiii-ally open branches which may be closed to .125 nation with a plurality of terminals, nor- I ene es said main cheat and a switch conmally closed holding circuit branches lea 1- -Jll'lS opened when the ing therefrom anda plurality of open st rtcc-(i. out of its nor ing'cirouit branches corresponrl'ng thereto, he star circuit with the terminals and mechanism for aclvancing it progressively comprising a motor magnet, of electromagnetic mechanism for controlling the operation of U magnet a contact element cooperating n p m in and mechanism for advancing it pro" ely comprising a motor nia nct, of two rriajvsr a main starting circuit lor ener sizing; them which is common to the startall The coinli' telephone instrin. iiiechanisiu having LQYIUHLZUS ranged in sets a no 6" closed hrai'nzh holding circuit leadinr v to one terminal cit each and a contact element cooperating therewith, of electronnwnetic l'ilGQlliiih for operating it progressively, relays which operate conjointly to control said sue nisin a main starting circuit inc 2 i having normally open brimches correspond.-

to the instrument circuits and means operated lay each instrument circuit for reversing the condition of its respective starting and holding circuit branches a main hold ing circuit for the relays which receives current over the closed holdin circuit branches during the advancement or the contact eleaent, a set of contacts in said circuit controlled by one of the reiays for destroying the holding circuit when the contact element enga jes the terminal oi" an open branch thereof. l

1:2. In a switching mechanism for ing up one of a plum lity of instiruiuen't' cuits and extending; it, the combine ion with terminals for said circuits, a con ment cooperating therewitln 'iBQCl'lilIllSIli ior adjusting the element and a locking do vice cooperating therewith, of a inagncl releasing it, having a circuit provided with. two sets of contacts controlled by two are lays, one of said relays heing adapted to he energized to close its contacts thereby conipleting the release circuit when the sr it l ing devices are moved out of their position, the other rcia being adopted to he energized by current in the extended line to hold its set of contacts open to l'tifi'iiii'lEln' rig-he release circuit inoperative itching; mcc

13. in, a s

w ,1. 7. log and entenomu one o srrumcnt circuits, he cor,

coop justing the operati therewith c the element he. with sets or normally open contacts, inc. struinent circuit is ext'e'ndec closed set of contacts, a reh the open set of contacts we energizedhaving a circuit 1 glued W ion the switch contact r. of ita normal position.

M. In a switchin mechanism for so niinals for said circuits, contact cooperalang therewith, mechai'i 1 "n in the element, a

or, two rela controlling said. circuit, one i conjunction with the switch operating;

anism to attract its armature thercbj '2 the release circuit capable of eondo .ng current when the switching mechani n a rest, the other relay operating in n with the extended instrument n rendering the release circuit incircuit OpEilhtiiti during the time the extended circuit maintained.

l5. 'l ho unbinatiou with a plurality of unient circuits, and a switch for selectone or another of said circuits comprisin terminals for the latter, a contact element cooperating therewith and devices for operating" the contact element and securing it in adjusted position, of a trip for releasing said element, a magnet for actuating" the trip into operative position, means for error giz-zing the magnet controlled by the instrument circuit and a relay actuated when said magnet energized for subsequently de'enen gizing it.

16. in switching mechanism for selectingr one of a plurality of instrument circui s and e riding" such selected line compr a plurality of line terminals and a Contact element cooperating therewith, the combina- Lion with devices for operating said. clen'ient in. one direction and restoring it, and a loch; inn device for holding the element in adjusted position, of a trip cooperating therewith a magnet for setting the trip in operative position and a circuit for the magnet, means adapted to be controlled by the selected. instrument circuit for! eii'ecting the ener ization of the magnet v and a relay tor subs: quentlv causing its dei-inergization and rendering: its circuit inoperative during the retro "ado movement of the contact element.

a switching mechanism for selectnd extendiine one, of a plurality oi. incircuits comprising a plurality oi 'ne termina ls and a contact element cooperitlnthe combinationwith ueariis magnet for i, Jtuating the trip intoan operative position, a. circuit for'said magnet and a relay actuated by the magnet 'for controlliiu; its circuit which causes the magnet to he rilei nergized immediately upon each enei giza Dion.

in a switching mechanism for select inc: and extene'linej one of a pluralitv of instrument circuits comprising a pllralitv' of terminals and acontact element cooper anon" therewith the combination with means 1" or advancing the element progressivelv and looking it in adjusted position. of a spring operated trip for uniockiniz the element; a magnet for actuating the trip into an operatire position having circuit, a relav couthe hitter. a relay startina' circuit 3 closed by the operation of the mag d ng one of a plurality of ins, the eombinetien with iine tee ninals, a Contact element therewith means for driving One directien and means for k in adjusted position, of a trip for Meg the element, a release magnet for .111 the trim having a circuit provided Li sets of contacts, three relays conmm which. are eereeped for can win opei-zii'imi one relay being adapted izo (time 011 E of contacts and render the circuit iii "tien be energized Whenever the corejemenb maxed out of its n=i rma} pcsiuien, the second relay being adapted open anefihei' of contacts to prevenc the energizing of the circuit While the extended ii'istrmnent circuit energized and the third \QYT' relay being :u'i's nged to open the third set of eoni cts after the release magnet has been i 111:; for actuating the trip areei' '1 se; :15. means for restoring the 1': normal position.

hing; mechanism, for s ene of a Mummy 0 :19, the eiement :ifi ieans for restoring it, ".qiiig the lacking device the trip in opei'at operating ii a (JiIC'ili'v'; n52 two sets of contacts oiing them, one relay '1, the eieetreimgneiic es and ads. is close we W11" energized. iipon the Jesse of the contae elemeiifien "Ker :i v being adapted 21b been-erg'ze Win12 in the ergeneieci inst "en the 0th: set of mechanism for seieet one 01? a piuialityof ineombinatien with e als a Contact element 1 21 '5 I v; devices for innerfiling the elem-elm iii. one direction. device fer SE01: ting the element in adiusted posi- "*i ii\ mews restoring the elemen'a and f0 Q s naming: the securing device, 03? eci'i'zating the trip, a circuit for having" a normaiiy closed am e s t of centeets. a reiay adept be energized 0v currentin the extended min circuit for opening; the dosed es aneitier relay adapted :36 0e ei1- ergized to e the some positiem fer selectii a p u zility 03.? in iietien with e a cenmeteleand a s ring for ellon into its normal ROTH-AL for iiGnalOiiil ed. to open me 0s ergized i current, in nded instrument circuit" second relay being adapted to 01050 P111047] 1 .3 and the third reie he ep-UL the third set "ed third relays haw de th switch and the contact element is g adapt- J! 7 m ezectrumngcleithe control to be eeiuateci e relays extending saw.

ESQ

i contacts included. in the booster circuit and when one of them is closed for antomati cally advancii'ig the contact elements and arresting them in ei'igagem it with the terminals of said closed instrument circuit, means for locking the elements in ad iusted position and cans tlior restoring them to their normal position, a trip for disengag ing the locking devices, a release magnet for actuating the trip provided with a circuit having two of contacts, a relay arranged in the extended instrument circuit which o1 eratesto open one set of contacts and render the release circuit inoperative While the extended circuit is energized, another relay for closing the other set of contact which is normally inoperative and rent red operative upon cessation of movement of the electromagnetic operating devices.

25.. The combination with a plurality of normally open instrument circuits, terminals therefor, a contact clement cooperating therewith and normall; inoperative electromagnetic do icer? for (i erating it automatic:.lly, of a booster circuit for supplying the initial impulse of current for starting said devices, means operated uponv the closing of an instrument circuit for energizing the booster circuit, a device for locking the contact element in adjusted position, a magnet for releasing it having a circuit which is adapted to he energized upon the opening of a previously closed selected instrument circuit, a relay, said relay having sets of normally open instrument circuits leading to the latter, a movable contact element coiipcrating therewith, electromagnetic devices for operating the element automatically upon the closing oi an instrumentcircuit and a devic for locking; the element in adjusted. position, of a trip for disengaging the locking device, a magnet for operating the trip having a circuit adapted to be energised upon the opening of a previously closed selected instrument circuit, a relay for initially onening said magnet circuit, a circuit controlling said relay Jvhlch is encrg izvd when the release magnet is energized; said relay circuit having a of normally closed contacts which are opened hiring the movoment of the electromagnetic operating devices.

27. in a switching mechanism For select ins and extending one of a p urality of instrument circuit-s comprising terminals therefor and a contact clement cooperating therewith, the combination with coiulcctor extending from. the element having}; nor-- mally closed contacts therein, means for advancing the Gllllltlltfl, a set of switch contacts which are closed when the element out o'l. its normal position and (it restoring the latter, of a relay for opening the conductor contacts having a nornrjxlly open. circuit. a second relay for closing,- said circuit which actuated hy the restoring devices, and a holding circuit fo the second relay which is controlled by the switch cootacts and retains its relay in enta-gised condition during the retrogral'le movemlmt-ol the contact element. y

28. Ina switching mechanism the combination with a plurality of normally open instrument circuits each comprising tvvo line Wires, terminals for said wires arranged in sets and separate contact elements adapted to cooperate with the corres ionding terminals of the several sets, and conductors leading from the c en'ients, of electromagnetic o 'icrating lgleri e actuated by the closing or an Eustrui'nent circuit to ad VZIHCB the elements into engagement with the terminals of said closed instrument circuits, of devices for restoring the elements to their normal position conuiirising a release magnet having a circuit provided with a. set of normally closed contacts, a relay bridged to the. conductors and openi a said contacts when a the conductors are supplied with cnrr: in from the connected instrument circuit and a, relay energized when the elements engage the terminals of said instrument circuit to close a second contact in. said release magnet. circuit.

29. In a switching mechanism, the combination with a'plur lity of full metallic instrument circuits which are normally open, a normally open branch starting circuit and a normallyiclosed branch holding circuit. for each i strument circuit and means operated when the instrun'ient circuits closed for reversing the condition of'their respeoirc branch circuits, terminals for the line W res of each instrument circuit and its ho circuit branch, said terminals being arranged in sets, separate contact elements arranged to cooperate W'th the corresponding terminals ot the several sets, circuit conductors leading from two of the elements and. a movalole member supporting the latter of do vices for advancing the niemhe one direction comprising a motor magnet and means for moving it in the opposite direction, of relays controlling the poration of the motor magnet having a starting circuit adapted receive an initial impulse 01 current trans mitted over the sta ting: circuit branch of a closed instrument circuit and also provided. with a holding; circuit to which current supplied successively by the closed holding 1 Oil 1,164,271 cit,

circuit branches, restoring devices for releasing the member comprising a release the other to operate such mechanism, and a second relay controlling contacts in the circuit of the first relay.

31. An automatic switching mechanism comprising the combination of contacts and selecting wipers, a relay and a motor magnet each adapted to repeatedly energize and deenergize the other to operate such mechanism, the number of energizations depending upon the electrical condition of sa1d contacts and a second relay having contacts in the circuit of the coil of said first relay.

32. In an automatic telephone system, the

combination of a calling and a called substation, automatic switching mechanisms for connecting such substations, one or more of such mechanisms comprising selecting switches, a relay and a motor magnet *ach adapted upon the removal of the receiver at the subscribers station to repeatedly close and open a local. circuit of the other to operate such mechanism, the rate of encrgization and deiinergization of the relay depending upon the naturai period of operation of the motor magnet.

In an automatic telephone system, the combination with a selector switch, of a re lay and a motor magnet therefor, said rclay controlling a pair of normally open contacts in the circuit of the motor magnet, said motor magnet controlling a pair of normally closed contacts in the circuit of the relay, the circuit of said relay being normally open at another point, a line relay at the central office individual to the subscribers line having contacts adapted to close the circuit of the first relay at the latter point whereby a vibratory action will occur between the lirs't relay and the motor magnet. and mecha 'nism adapted to be advanced step-l y-step by the operation of the motor magnet.

34. In an automatic telephone system, the combination with a selector switch having stationary contacts and selecting wipers, of a relay and a motor magnet therefor, a pair of normally open contacts controlled by said relay, the circuit of said motor magnet being controlled by the contacts of said relay, :1 pair of normally closed contacts for said motor magnet, adapred when opened to sever the circuit through said relay \\'l1c1'cl) the circuit of said motor magnet is interrupted. a second relay having contacts in the circuit of the lirstand having a circuit of its coil completed through the stationary contacts and the selecting wipers of said selector switch.

BERT (l. DUNHAMW Witnesses: s

G. \Vnmum RICH,

RUSSELL B. Gmrrrrn. 

